With the sixth series already commissioned, the big question is how long Mercurio can continue with Line of Duty. “I don’t know,” he says.
“We all love making the show but I think a lot depends on how people respond to it.
“The first thing you do is check that you’re not dead,” says Dunbar of receiving fresh scripts.
The first series of Line of Duty, which tells of the fictional police anti-corruption unit AC-12, went out in June 2012, becoming BBC2’s best-performing drama of the preceding 10 years.